staging: hi6421-spmi-pmic: better name IRQs

Instead of naming them as just "hisi", use hi6421v600 to
make it clearer.

Suggested-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/327fb075905b889a43a0f9dced29ea9966d611f8.1624606660.git.mchehab+huawei@kernel.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>